When a Stranger Calls

Jill Johnson is babysitting the children of Dr. Mandrakis at his home. The children are asleep, and Jill receives a telephone call from a man who asks her if she has checked the children. Jill initially dismisses the call as a practical joke. However, he calls again and again, the calls increase in frequency and threats, and Jill becomes frightened. She calls the police, who tell her to keep the perpetrator on the line long enough for them to trace the call. Jill receives one final call from her harasser. Immediately after the conversation, the police phone to inform her that the calls are coming from a line located somewhere inside the house. Jill sees the intruder's shadow as she tries to exit the house and narrowly escapes. When the police arrive, it is revealed that the killer, an English merchant seaman named Curt Duncan, killed the children shortly after Jill arrived. He leaves Jill unharmed, and after his trial, he is sent to a psychiatric facility.